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है”ह”ह

IS 7595-5 (1991): Fishing vessels - Otter boards, Part 5:Vee type otter boards [TED 18: Inland, Harbour Crafts andFishing Vessels]

IS 7595 ( Part-5 ) : 1991

Indian Standard

FISHING VESSELS - OTTER BOARDS PART 5 VEE TYPE OTTER BOARDS

UDC 639.2081s11 : 636.95 : 599-742-4

@ BIS 1991

BUREAU OF I~NDIAN STANDARDS MANAK BHAVAN, !?! BAHADUR SHAH ZAFAR MARG

NEW DELHI 110002

December 1991 Price Group 2

Fishing Vessels Sectional Committee, TED 2 I

FOREWORD

This Indian Standard was adopted by the Bureau of Indian Standards, after the draft finalized by the Fishing Vessels Sectional Committee had been approved by the Transport Engineering Division Council.

VEE type otter boards are extensively used for their good performance on very hard and irregular grounds. It is relatively inexpensive to manufacture and has a long working life. The spreading qualities of the VEE type boards are, however, slightly inferior to other types of boards.

The interchangeability of towing bracket is an important factor in favour of VEE boards, because boards can be fitted either way around to make either a port or starboard side otter board.

This standard is one of the series of Indian Standards on otter boards. Other standards in the series are:

IS 7595 General requirements for otter boards: ( Part 1 ) : 1975 Flat rectangular otter boards

( Part 2 ) : 1976 Rectangular hortzontally curved otter boards ( Part 3 ) : 1977 Oval otter boards

( Part 4 ) : 1986 Application standard

(Part 6 ) : 1991 Guidelines for selection

Indian Standard

FISHING VESSELS - OTTER BOARDS PART 5 VEE TYPE OTTER BOARDS

1 SCOPE

This standard ( Part 5 ) specifies materials and general requirements of VEE type otter boards.

2 REFERENCES

The following Indian Standards are necessary adjuncts to this standard:

IS No. 226 : 1975

513 : 1986

816 : 1969

1084 : 1983

1161 : 1979

1323 : 1982

1404 : 1970

2266 : 1977

5537 : 1970

5986 : 1970

7283 : 1974

759~5 ( Part 1 ) : 1975

Title Structural steel ( standard quality ) (fifth revision )

Cold-rolled low carbon steel sheets and strips ( third revision )

Code of practice for use of metal arc welding for gene- ral construction in mild steel (first revision )

Manila ropes ( third revision )

Steel tubes for structural purpose ( third revision )

Code of practice for oxy- acetylene welding for struc- tural work in mild steels ( second revision )

Anti-corrosive paint, brush- ing for ships bottom and hulls, red or chocolate ( second revision )

Steel wire ropes for general engineering purposes (second revision )

Lashing chains

Hot rolled steel plate and flats for cold forming and flanging operation for auto- mobile and general purposes

Hot-rolled bars for produc- tion of bright bars

General requirements for otter boards : Part 1 Flat rectangular otter boards

3 TERMINOLOGY

For the purpose of this standard, the definitions given in IS 7595 ( Part 1 ) : 1975 shall apply.

4 MATERIALS

Name of Part Material Conforming to

Keel IS 226’ Top frame IS 1161 Body IS 513

IS 226 Bracket IS 5537 -Backstrop IS 2266 G link IS 7283 Keliys’ eye IS 7283

Figure of 8 link IS 7283 Fittings IS 5986 Chain bridle IS 5537 Towing rope IS 1084

IS 2266 Tie rods IS 1161

5 CONSTRUCTION

5.1 The VBE type otter board is built to a simple structure made entirely of mild steel thick wall tube, solid round bar and plate. The typical design of a VEE type otter board is shown in Fig. 1 and is constructed as follows.

5.1.1 The keel section of the main frame is made of solid steel bar bent into the required shape.

5.1.2 Thick walled steel tube is bent to shape and the ends butt-welded to the ends of the keel to complete the main frame.

5.1.3 The main frame is then bent in accord- ance with the geometry shown in end elevation in Fig. 1 and then covered with a mild steel sheet of light gauge and welded.

5.1.4 The towing bracket is then attached taking care of interchangeability to allow the board to be fitted on either side.

5.1.5 Two back tie rods, made out of thick wa!led tube similar to that used for the top frame shall be welded onto the back plate as shown in Fig. 1.

5.2 For protection against corrosion all metal parts shall be painted with a paint conforming to IS 1404 : 1970.

IS 7595 ( Part 5 ) : 1991

-5.3 The welding shall be carried out in accord- approximately at 20 percent of the length of the ante w-ith IS 816 : 1969 or IS 1323 : 1982, as board from the rear edge of the board. applicable to the process adopted.

.6 DIMENSIONS 6.4 Backstrop

6.1 The dimensions of VEE type otter board of about 1.3 ma are shown in Fig. 1. The length of the backstrop and bridle shall be

as agreed to between the manufacturer and the 6.2 The length and width of the otter board purchaser. shall preferably be in a ratio of 2 : 1 to 2 : 1.2. Higher ratios may also be adopted. 6.5 Shear Angle 6.3 Rings ‘The fittings for rings on the outer side of the Shear angle for VEE type otter boards ranging board for connecting the ‘oackstrop shall be between 30” and 40” is considered most suitable.

3

Standard Mark Theuse of the Standard Mark is governed by the provisions of the Bureau of Indian

Standards Act, 1986 and the Rules and Regulations made thereunder. The Standard Mark on products covered by an Indian Standard conveys the assurance that they have been produced to comply with the requirements of that standard under a well defined system of inspection, tosting and quality control which is devised and supervised by BIS and operated by the producer. Standard marked products are also continuously checked by BIS for con- formity to that standard as a further safeguard. Details of conditions under which a licence for the use oft he Standard Mark may -be granted to manufacturers or producers may be obtained from the Bureau of Ihdian Standards.

Bareso of Indian Standards

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,. a,+ attending to connected matters in the country. ,$!,.I ’ j,

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e copyright of all its publications. No part of these publications may be reproduced in any the prior permission in writing of BIS. This does not preclude the free use, in the course of the standard, of necessary details, such as symbols and sizes, type or grade designations,

ting to copyright be addressed to the Director (Publications ), BIS. I. ,.

‘Revision of Indian Standards

Indian Standards are reviewed periodically and revised, when necessary and amendments, if any, are issued from time to time. Users of Indian Standards should ascertain that they are in possession of the latest amendments or edition. Comments on this Indian Standard may be sent to BIS giving the following reference:

Dot_: No. TED 21 ( 768 ) \

Amendments Issued Since Publication

Amend No. Date of Issue Text Affected

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